Which four basic variables compose a photographic film exposure?

The correct answer is based on the foundational principles of photography exposure. In this context, the four basic variables that compose a photographic film exposure are subject light, camera lens aperture, shutter speed, and film speed, as they collectively determine the amount of light that reaches the film and how it is captured.

Subject light refers to the available light in the environment where the photograph is taken, which affects exposure and image quality. The camera lens aperture controls the size of the opening through which light enters, influencing both the depth of field and the amount of light that reaches the film. Shutter speed determines how long the film is exposed to light, allowing for the capture of motion or stillness in the image. Film speed, measured in ISO, indicates the film's sensitivity to light, impacting how well it can capture images in various lighting conditions.

In combination, these four factors interact to create a properly exposed photograph, making this answer comprehensive and aligned with key photographic concepts. Familiarity with these variables is crucial for anyone involved in photography or latent print examination, as it impacts both image capturing and analysis.